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News StoriesJune 7, 2007
Warming called threat to farmers, salmon
"The warming in the West can now confidently be attributed to rising greenhouse gases and are not explained by any combination of natural factors," said Philip Mote, head of the Climate Impacts Group at the University of Washington.
Mote said some models show temperatures in the West could rise by 6 degrees Fahrenheit in the coming years. Signs of climate change, such as lilacs blooming earlier in the spring, are just a "harbinger of changes to come," he said.
Among other things, the Senate Energy and Natural Resources water and power subcommittee learned:
•Southern California is experiencing its driest year on record, and Lake Mead, which supplies water to large parts of the fast-growing Southwest, could be empty in 10 years.
•By some estimates, populations of Pacific salmon in the Northwest could drop between 20 percent and 40 percent by 2050, with even greater losses in California and Idaho. Western trout populations eventually could fall by more than 60 percent.
•A dead zone of "very low dissolved oxygen" has appeared every year in the Pacific Ocean off the Oregon coast since 2001, and unlike other ocean dead zones, pollution or other human activity isn't believed to be the cause. Instead, some scientists say there may be a "fundamental change" occurring in the ocean off the West Coast, changes that may involve wind patterns "modified" by climate change.
•Tens of thousands of irrigated acres will fall out of production as water supplies tighten, and tensions over water supplies will only be exacerbated as the effects of climate change deepen.
"These changes will force us to adapt how we manage irrigation and agriculture, our hydropower system, salmon recovery, municipal water supplies and flood control," said Sen. Maria Cantwell, D-Wash., who chaired the hearing.
In Washington state, Tim Culbertson, general manager of the Grant County Public Utility District, said interim storage reservoirs are being considered at Black Rock in the Yakima Valley and at Crab Creek in the Columbia Basin Project.
Cantwell said Congress and the federal government may have to rethink its skepticism over building more reservoirs, which can be filled when flows are high and drained during summer months.
"We have turned away from reservoirs, right or wrong," Cantwell said. "Maybe we should rethink that."